public class Test {
    public static void main(String[] args) {
        String s1 = "hello";
        String s2 = "he" + new String("llo");
        System.err.println(s1 == s2);
        test();
    }

    public static void test() {
        Byte a = 127;
        Byte b = 127;
        add(++a);
        System.out.println(a);
        add(b);
        System.out.println(b);
    }

    public static void add(Byte b) {
        b++;
    }
}

abstract class Test2 {
    public int a = 5;

    public abstract void method(int a);
    public void method() {

    }
}